OMB Meeting Book - Jan. 11, 2018

2016.03 (Nov. 2017) - Chlor-02/04 Final Action Review FOR ERP USE ONLY DO NOT DISTRIBUTE

(i) KNO 3 solution, c = 1 mol/l.

Weigh 10.11 g potassium nitrate (C. j) into a 100 ml volumetric flask. Add about 80 ml water and place it in an ultrasonic cleaner (B. m) to dissolve with ultrasound and heating until dissolved thoroughly. Cool down to room temperature and make up to the mark with water. Filter using a 0,45 membrane disposable syringe before use.

E.

Sample preparation

(a) Powders, for milk, milk products, and infant formula powders

Mix well to ensure that the sample is homogeneous, Reconstitute powder samples by dissolving 25 g powder sample in 200 ml warm water (40 °C).

(b) Cheese, for hard or rinded cheese

Prior to analysis, remove the rind or smear or mouldy surface layer of the cheese, in such a way as to provide a sample representative of the cheese as it is usually consumed. Grind or grate the sample by means of an appropriate device. Mix the ground or grated mass quickly, and if possible grind or grate a second time and again mix thoroughly. If the sample cannot be ground or grated, mix it thoroughly by intensive stirring and kneading. Transfer the sample to an airtight container to await analysis, which should be carried out as soon as possible after grinding. If delay is unavoidable, take all precautions to ensure proper preservation of the sample and to prevent condensation of moisture on the inside surface of the container. The storage temperature should be 10 °C to 12 °C.

10

12